[LLVMbugs] gccas bug; testcase enclosed

[John Mellor-Crummey]

We are using LLVM from CVS and encountered a bug in gccas. We used 
bugpoint to help pinpoint the error.

command to repeat error:

opt bugpoint-passinput.bc -simplify-libcalls

the offending file is attached.

Unfortunately, bugpoint fell over while trying to reduce the test 
case. It emitted the error message:

Checking instruction '': Success!
PHINode should have one entry for each predecessor of its parent basic block!
         %i.3 = phi int [ %inc.11, %endif.5 ], [ 0, %endif.0 ], [ 0, 
%endif.0 ], [ 0, %endif.0 ], [ 0, %endif.0 ], [ 0, %endif.0 ] 
; <int> [#uses=3]
Broken module found, compilation aborted!
Checking instruction 'tmp.208': bugpoint((anonymous 
namespace)::PrintStackTrace()+0x1a)[0x873fada]
bugpoint((anonymous namespace)::SignalHandler(int)+0xcb)[0x873fd4d]
[0xffffe420]
/lib/libc.so.6(abort+0x16d)[0xb7dd236d]
bugpoint((anonymous namespace)::Verifier::abortIfBroken()+0xd5)[0x86fe6d3]
bugpoint((anonymous 
namespace)::Verifier::runOnFunction(llvm::Function&)+0x57)[0x86fdd6f]
bugpoint(llvm::PassManagerTraits<llvm::Function>::runPass(llvm::FunctionPass*, 
llvm::Function*)+0x1f)[0x86e1905]
bugpoint(llvm::PassManagerT<llvm::Function>::runOnUnit(llvm::Function*)+0x5c3)[0x86d7657]
bugpoint(llvm::PassManagerTraits<llvm::Function>::runOnFunction(llvm::Function&)+0x1f)[0x86d820d]
bugpoint(llvm::FunctionPass::runOnModule(llvm::Module&)+0xa7)[0x868c7d7]
bugpoint(llvm::PassManagerTraits<llvm::Module>::runPass(llvm::ModulePass*, 
llvm::Module*)+0x1f)[0x86e199b]
bugpoint(llvm::PassManagerT<llvm::Module>::runOnUnit(llvm::Module*)+0x5c3)[0x86d57e3]
bugpoint(llvm::PassManagerTraits<llvm::Module>::runOnModule(llvm::Module&)+0x1f)[0x86d6e77]
bugpoint(llvm::PassManager::run(llvm::Module&)+0x23)[0x868bbe1]
bugpoint(llvm::BugDriver::deleteInstructionFromProgram(llvm::Instruction 
const*, unsigned int) const+0x366)[0x840696a]
bugpoint[0x83f6209]
bugpoint(llvm::BugDriver::debugOptimizerCrash()+0x1cf)[0x83f6669]
bugpoint(llvm::BugDriver::run()+0x5d)[0x83f3207]
bugpoint(main+0xc7)[0x84149cf]
/lib/libc.so.6(__libc_start_main+0xb8)[0xb7dbd488]
bugpoint[0x83f29c1]
Abort
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